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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d5d741b2ebfb798dddb41ee5c36ee57d5e6248614b8ec6d7de40ba2c35b7b8b' 
  AND token = '0l+RBJtPQscQC1zkx1ZtciQu49I2aANP08F5AIYuLi8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}